What's a fast way to get a Pokemon's happiness
up...

When it's a level 73 Regigigas? I gave him a Soothe Bell, I've already bought him an expensive drink from the Juice Shoppe (don't remember which one. I just know that it increased happiness), and I've already given him a massage. Is there any good way other than leveling him up?

Stupid Return. Why can't there be another good Normal type attack?---I was once modded for illegal activity because I made a topic asking for advice on nicknaming my Pokemon.3DS FC: 5043-2277-6391 - THIEF

Use the Happiness O-Power. It makes Massages really overpowered, especially with the Soothe Bell.

Yeah, I forgot about the O-Power until after I gave him his massage for today. :/I was hoping I'd be able to test out my Double Team Substitute Regigigas with Dual Screens support, but I guess that'll have to wait for a little longer.---I was once modded for illegal activity because I made a topic asking for advice on nicknaming my Pokemon.3DS FC: 5043-2277-6391 - THIEF

Use EV reducing berries in combination with the O-power and Soothe Bell.

Where do I get the EV reducing berries?

You have to breed them using Surprise Mulch in the berry farm, IIRC.---Pokemon Emerald Sacrificial Randomizer Darklocke (Nuzlocke): http://www.gamefaqs.com/boards/2000300-pokemon-emerald-social/685199913DS FC: 0559-6813-5961